Windows Media Player 9

So I upgraded to version 9 Beta, which so far works really well, except for the slider at the bottom. On most of the videos I play, if I try to move the slider, the video file just starts over again. I can somtimes start the video, and just before it starts I can click a position on the bar and it will work, but usually it just starts over.

I'm sure this is a bug because on videos where I can move it around, if I do it enough the video will begin to start over when I move it. These files used to work on WMP7